From b4fc2e38ab344b80bd3b1b6d613774b5caf560f6 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Mon, 22 Jun 2015 17:27:29 +0200
Subject: pcm/Interleave: add stereo optimization

---
 src/pcm/Interleave.cxx | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'src/pcm')

diff --git a/src/pcm/Interleave.cxx b/src/pcm/Interleave.cxx
index 1152a7070..ed9fc125d 100644
--- a/src/pcm/Interleave.cxx
+++ b/src/pcm/Interleave.cxx
@@ -36,12 +36,31 @@ GenericPcmInterleave(uint8_t *gcc_restrict dest,
 	}
 }
 
+template<typename T>
+static void
+PcmInterleaveStereo(T *gcc_restrict dest,
+		    const T *gcc_restrict src1,
+		    const T *gcc_restrict src2,
+		    size_t n_frames)
+{
+	for (size_t i = 0; i != n_frames; ++i) {
+		*dest++ = *src1++;
+		*dest++ = *src2++;
+	}
+}
+
 template<typename T>
 static void
 PcmInterleaveT(T *gcc_restrict dest,
 	       const ConstBuffer<const T *> src,
 	       size_t n_frames)
 {
+	switch (src.size) {
+	case 2:
+		PcmInterleaveStereo(dest, src[0], src[1], n_frames);
+		return;
+	}
+
 	for (const auto *s : src) {
 		auto *d = dest++;
 
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